Quick Xover check/frustrations.

[Mgboy]

So. Got new parts in today, wired up to test and am getting funny/frustrating results.

Aside from twisting (alligator clips disappeared!) is everything wired up correctly? Is there something big I'm missing?

http://img192.imageshack.us/img192/2653/xoverpic.jpg

This is what it should act/look like
http://img40.imageshack.us/img40/7110/graph1g.gif
http://img52.imageshack.us/img52/9508/xoverschem.jpg

These are what it does look like. Close + 1m
http://img534.imageshack.us/img534/4228/wtfthis2.jpg
http://img683.imageshack.us/img683/7241/wtfthis.jpg

[arlis_1957@yahoo.com]

that looks to be not right please post the schematic.

[Mgboy]

that looks to be not right please post the schematic.

http://img52.imageshack.us/img52/9508/xoverschem.jpg

[whatatrip]

I see a 2.2 mH inductor (with a .22 uF cap in parallel with the inductor) in series with a .22 mH inductor and a 22 uF cap in parallel.

Looks like a 3rd order electrical xover for a woofer. What woofer is this for?

[whatatrip]

Looks like you have it wired correctly. Hopefully Arlis will confirm this also.

[Mgboy]

Looks like you have it wired correctly. Hopefully Arlis will confirm this also.

Well, something has to be wrong. Lookie here. I'll let the pictures do the talking.

http://img263.imageshack.us/img263/8581/xoverpic2.jpg
http://img46.imageshack.us/img46/1451/test2om.jpg

With the last (.22) inductor bypasses, it looks as it should. That last inductor was merely for phase shaping purposes, and to knock the twin peaks down about 3-5 db more.


Woofer is RS180

[arlis_1957@yahoo.com]

pcd has a schematic fuction that i can read.

[Mgboy]

pcd has a schematic fuction that i can read.

This? :rolleyes:

http://img256.imageshack.us/img256/452/ezschem.jpg

[Jeff B.]

So. Got new parts in today, wired up to test and am getting funny/frustrating results.

Aside from twisting (alligator clips disappeared!) is everything wired up correctly? Is there something big I'm missing?

http://img192.imageshack.us/img192/2653/xoverpic.jpg

This is what it should act/look like
http://img40.imageshack.us/img40/7110/graph1g.gif
http://img52.imageshack.us/img52/9508/xoverschem.jpg

These are what it does look like. Close + 1m
http://img534.imageshack.us/img534/4228/wtfthis2.jpg
http://img683.imageshack.us/img683/7241/wtfthis.jpg

What you show in the photo matches what you show in PCD. The rest I can't really comment on.

[Mgboy]

What you show in the photo matches what you show in PCD. The rest I can't really comment on.

Hello Jeff! The man himself. ;) What do you make of post 6? I bypassed the .22 mH inductor, and the response changed to how it shows in PCD, so is there something wrong with that last inductor wiring? With it in place, the response rises from 1-2khz THEN tanks. It doesn't make sense. =(

[Wolf]

Either way, you require a resistor in series with teh 0.22uF cap of about 4 ohms, OR a resistor after the 22uF. This is because you will be getting a short at ultrasonic frequencies if you don't have a load here.

Your schematic matches the sim. Other than that, I'm in the same dinghy as Jeff.
Later,
Wolf

[Mgboy]

Either way, you require a resistor in series with teh 0.22uF cap of about 4 ohms, OR a resistor after the 22uF. This is because you will be getting a short at ultrasonic frequencies if you don't have a load here.

Your schematic matches the sim. Other than that, I'm in the same dinghy as Jeff.
Later,
Wolf

Would a 3 ohm resistor after the 22uF cap work? In series there, or parallel? What do you make of post 6? Bypassing the last inductor yields the correct response. The .22 mH inductor isn't filtering out much aside from another 3-5 dB in the RS180's twin peaks. It's mostly there to get nigh perfect phase alignment and a much much deeper reverse phase null. If I can get this working, the tweeter+woofer should be tracking from about 600-7000 Hz.



*** Edit. Get this! I measured the same woofer, without changing ANYTHING from yesterday, and it measures perfectly [how it should]. Unfortunately, the other woofer/lpf is doing the same thing it was yesterday. I don't understand why the heck this isn't working out how I wanted. Both LPF's are wired up identically, with both woofers wired to their prospective filters identically. This still isn't making any more sense.

[whatatrip]

*** Edit. Get this! I measured the same woofer, without changing ANYTHING from yesterday, and it measures perfectly [how it should]. Unfortunately, the other woofer/lpf is doing the same thing it was yesterday. I don't understand why the heck this isn't working out how I wanted. Both LPF's are wired up identically, with both woofers wired to their prospective filters identically. This still isn't making any more sense.

Switch woofers to find out if it is the xover or the woofer. If the woofer that you are getting good result on is good on the other xover, then it is the xover.